View Compilation Error

0_0_14917870_7234.cpp: In function 'int main()':
0_0_14917870_7234.cpp:154:6: error: 'k' was not declared in this scope
    ++k;
      ^
0_0_14917870_7234.cpp:170:29: error: expected ')' before ';' token
   printf("%d\n",sap(st,ed,n);
                             ^